@irlandaise It is never, ever -ed. Trans* isn’t a verb and should never be past tense.
@Nrdsb4 There is a wonderful guide called “Genderbread Person” that can be very helpful for people just being introduced to SOGI issues. Highly recommend googling it 
Note: SOGI is what a lot of people globally are transitioning to instead of LGBT. It stands for Sexual Orientation and Gender Identity and thus is much more inclusive.